Through televised inspections of sanitary sewers, the Public Works Department is able to identify defects within the sewer. By analyzing the defects, the proper course of action is determined to address the identified defects. The appropriate course of action is generally limited to either lining the pipe segment or replacing the defective section of pipe with a new section of pipe.
Sanitary Sewer Lining Program (Cured in Place Pipe, CIPP)
Sanitary sewer lining is a trenchless technology whereby a "sock" that contains different resins is pulled through the defective pipe. The next step involves passing hot water or steam through the pipe, which reacts with the resins causing the "sock" to cure and hardened in the shape the defective pipe. The result of this process is a seamless, joint free "pipe within a pipe." The new pipe creates a smooth, continuous inner surface that usually increases flow capacity and eliminates any defects that were previously present. The final step of the process is reestablishing the house connections to the main. When the "sock" is pulled through the pipe and hardens, the house connections to the main are blocked and must be reestablished to allow for grey water to flow from the home to the main. Once the new pipe has cured (typically 8 - 18 hours depending on the size of pipe), a device is placed in the sewer and travels down the main cutting out the existing connections. This quick and non-disruptive process typically allows for the complete installation of pipe and the connections to be reestablished in the same day. Please contact the Public Works Department at 847/870-5640 or email Public Works with any questions concerning the sanitary sewer lining program.
If your pipe is to be lined what should you know?
- Please make sure your toilet seat is down. The lining process involves spraying water through the main at high pressure potentially creating noise and water to spray or splash out of toilets as the "jetter" travels past your service connection.
- Please make sure to pour a cup of water into your basement floor drain to fill the trap. By ensuring the trap is filled with water the odor that is produced during the lining process will be blocked from entering the home through your floor drain. This is a good practice throughout the year to prevent sewer gas from entering the home.
- Please limit your use of household activities that produce sanitary water during the lining process. Limited use of toilets (few flushes) is ok; however, we ask that you refrain from using the laundry and dishwashing machine while crews or working. Once your service connection to the main has been reestablished, your sanitary water will flow uninhibited to the main.
- Typically crews begin work at 7 a.m.
The Village's contractor Hoerr Construction is scheduled begin the process of televising the week of March 30. Hoerr is required to televise all sewers scheduled for lining prior to installing the liner. It is anticipated the it will require at least one month to complete the televising.
The contractor is tentatively scheduled to start installing liners the month of May. The contractor anticipates completing the installation of all liners by the end of June.
How will I know if I am affected by the lining project?
You will receive a letter in the mail describing the process and anticipated start date.
Will I be notified when the contractor starts work on the sewer?
Yes the contractor will leave a door hanger a day or two prior to the work starting. The door hanger will identify the date and time of the work.
Can I still use water when the sewer is being lined?
You can still use water, but we ask that you limit your water use to only a few toilet flushes. During the lining of the sewer your sewer service connection (the sewer pipe that conveys dirty water from your home to the Village sewer) will be obstructed. Meaning that all waste water from your home will be stored in your sewer service until the connection to the sewer main is reestablished. From the start of the lining process until the reestablishment of your service connection can take 8 to 18 hours depending on the size of the sewer main. During this period please refrain from activities that require significant water use like laundry, dishwashing (hand or machine) or showers.
There is a strong smell in the air when they started work on the sewer. What is it?
The lining process involves pulling a felt liner impregnated with plastic resins through the existing sewer pipe. Hot water or steam is then forced through the felt lining activating the resins, which harden into a plastic pipe over the 8 to 18 hour curing process. During the curing process you will smell the plastic resins curing. The smell is non-toxic and will not harm children, adults or animals.
Will the new liner reduce the capacity of the sewer?
The liner is only a few millimeters thick and will not adversely affect the capacity of the sewer.
Village of Mount Prospect
Dan Wiegand, Project Foreman